Stylus for making sound records



Oct. 15, 1935. w. HESSE STYLUS FOR MAKING SOUNb RECORDS Filed Oct. 15,1932 d bi 17;. fly. I2 fig /4 Q Q l fly- 22 19:92 25,

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6 WHLTf/Ef? f/sssz QTTOEA/[SY w a a 6 E C H Z I. a a a K G Patented Oct.15, 1935 UNITED STATES PATENT} OFFICE s'rrLUs Fon MAKING SOUND nnconnsWalther Hesse, Aachen, Germany Application October 15, lcsa'seriai N...637,961 In Germany October 29, 1931 3 Claims.

two cutting edges of said cutting point portion forming with each otheran angle of substanti'ally 90.

The invention will appear more clearly from the following detaileddescription when taken together with the accompanying drawing showingpreferred embodiments of the inventive idea.

In the drawing:

Figure 1 shows in side elevation a'stylus of the type used in prior art.

Figure 2 is a bottom plan view of the stylus shown in Figure 1.

Figure 3 shows in front elevation another stylus of the type used inprior art.

Figure 4 is a bottom plan view of the stylus shown in Figure 3.

Figure 5 is a front elevational view of a different stylus known inprior art.

. Figure 6 shows in front elevation a stylus made in accordance with theprinciples of the present invention.

Figure 7 shows in side elevation the stylus illustrated in FiguredFigure 8 is a back view of the stylus illustrated in Figure 6.

Figure 9 is a section along the line A--B of Figilre '1. a Figures 10,11 and 12 are front view, side view and back view, respectively, of adifierent stylus. Figure 13 is a section along the line C-D of Figure11.

Figures 14, 15 and 16 are front view, side view and back view,respectively, of another stylus. Figure 17 is a section along the lineE-'F of Figure 15. r

Figures 18, 19 and 20 are front view, side view and back view,respectively, of a different stylus.

Figure 21 is a section along the line G-H of Figure 19.

. I6 Figure 23.

.the stylus in the holder.

The point of the known styluses of this kind forms, as shown inelevation and bottom plan views in Figs. 1 to 4 a three-sided orfour-sided pyramid. Styluses are also known which, as

shown in Fig. 3, are formed by an equilateral triangular cutting platebevelled at the edges on both sides, which plate is detachahly connectedto the shank of the stylus by a screw. As in the known styluses withpyramidic point" the base I of the point corresponds to the crosssection of 10 the shank, these styluses are not very rigid. The

same applies to the styluses with a triangular cutting plate flxed-onthe shank by screws, especially as this plate is relatively thin and itsintersecting cutting edges form an angle of only These 15 known stylusesconsequently vibrate considerably when cutting sound grooves in recordsof hard material, such as hard rubber and metal, and cut and tear chipsfrom the record. The sound records cut in hard record plates'by meansof20 these known styluses are consequently not sharp and clean so thatdisturbing secondary noises and considerable distortion of tone occurwhen such records are played. These objections are over- I come byemploying the styluses according to the 25 invention.

The invention consists substantially in that the point worked from thematerial of the circular or non-circular shank is wider at its base thanthe shank of the stylus. When'cutting sound grooves even in hard recordsby means of the stylus according to the invention, all detrimentalvibrating of thestylus is avoided, owing to the special shaping of itspoint, and consequently a very clean cut is produced because acontinuous chip is cut from the record.- Records produced with thisstylus therefore give a reproduction without disturbing secondary noisesand distortion of tone. Moreover, by the shape of the point of theshaft, convenient flat gripping sur- 40 faces are produced thereon,which facilitate the correct insertion of the stylus into the holder ofthe sound box, which is very important for making records. Owing to theflat shape of the point the new stylus also presents the advantage, that45 it can be provided by means .ofcolour or in some other manner withclearly visible markings onits point to further facilitate the properfitting of The bevelled lateral edges cf the point of the 50 styluspreferablyform an angle of about A stylus constructed in this mannerproduces a particularly clean cut.

Experiments have shown that it is particularly advantageous to: thepoint to have either'a flat c5 surface both on its front side and alsoon its rear points of the different styluses.

side, or a flat surface on one side and a recessed surface on the otherside.

Five embodiments of the invention are illustrated by way of example inFigs.-6 to 25 of the accompanyin drawing.

In all five forms of construction a point a, 12 having chisel-shapededges is worked from a shank c, which point is wider at its base thanthe shank c so that the point projects beyond the shank on each side.The two cutting edges a and b of the point form an angle ofapproximately and are undercutground or bevelled from the front towardsthe rear. The examples illustrated differ chiefly only as regards theshape of the surfaces on the front and rear sides of the In theconstruction shown in Figs. 6 to 9 the point of the stylus has flatsurfaces d and e on its front and rear sides, which surfaces areslightly inclined relative. to the longitudinal axis of the shank c. 1

In the construction illustrated in Figs. 10 to 13 the point of thestylus only has a flat surface a slightly inclined to the longitudinalaxis of .the

shank c on its rear side, whereas on its front side .it is provided witha hollow surface f, which is formed by two surfaces inclined towards oneanother to form an obtuse angle.

In the form of construction according to Figs.

14 to 17 the point has on its front side, a flat surshank and on itsrear side a hollow surface corresponding to an imaginary cylinder, thelongitudinal axis of which is parallel to the longitudinal axis of theshank.

The stylus illustrated in Figs. 22 to 25 has on its 5 front side a flatsurface m slightly inclined to the longitudinal axis of the shank, andon its rear side a recessed surface n corresponding to a portion of thesurface of an imaginary ball.

I claim:'-. v 10 l. A stylus for making sound records, comprising ashank having a cutting point and cutting side edges with flattened andconverging front and rear faces, said cutting side edges being formed byan upwardly and rearwardly bevelled 15 end of the stylus, forming ablunt V-shaped cutting edge, the stylus at the end of said bevels beinglaterally enlarged.

2. A stylus for making sound records, comprising a shank'having acutting point and cutting 20 side edges with flattened and convergingfront and rear faces, said cutting side edges being formed by anupwardly and rearwardly bevelled end of the stylus, forming a bluntv-shaped cutting edge, the stylus at the end of said bevels 25 beinglaterally enlarged, the converging rear face being inwardly andoutwardly curved.

3. A stylus for making sound records, comprising a shank having acutting point and cutting side edges with flattened and converging frontand rear faces, 'said .cutting side edges being formed by an upwardlyand rearwardly bevelled end of the stylus, forming a. blunt V-shapedcutting-edge, the stylus at the end of said bevels being laterallyenlarged, said flattened front face 35,

having a lower portion which extends outwardly away from said rear face.

WALTHER HESSE.

